News

New digestate storage tanks will be built for the biogas plant Recycling Energie AG in Nesselnbach, Switzerland. Four tanks with each 6200 m³ are needed for the storage of digestate during the winter. Digestate as high quality fertilizer is spread on nearby fields during the rest of the year. AAT is responsible for engineering, equipment and start-up of the plant. Technical data of the plant: - 90,000 t/a digestate - 4 CSTR final storage tanks with each 6,200 m³ volume - Biogas upgrading with CNG-filling station and combined CO 2 -liquefaction - Start-up scheduled: end of 2025

Soon the year is coming to an end and we want to take this opportunity to thank you for your confidence in us and for the convenient co-operation. The team of AAT wishes you and your families some peaceful and joyous holidays and a good start into the new year 2025! This year we support the charity „Netz für Kinder (net for children)“.

After finishing of the all tender procedures Olsztyn municipality together with nominated technology provider AAT started to build a biogas plant. In this biogas plant 115 t/d of organic waste (mainly the separately collected food/kitchen) waste will arrive to the site and further will be prepared and digested. From the produced biogas the electricity will be generated with a power of up to 1MW. To provide more flexibility to the future biogas plant was decided to design and build 2 independent lines with digester, post digester and final storage on each line. The biogas plant will be equipped with a most innovative and efficient equipment for the waste treatment and fermentation from the well-known European manufactures. Technical data of the plant: - 2 digesters with 4,000 m³ volume each (Ø 22m x 6 m) - Biogas production: 408 Nm³/h - Capacity generation electrical energy: 1MW - Energy generated: 8760 MWh/a - Capacity generation thermal energy: 1MW - Thermal energy generated: 8760 MWh/a - Fertilizer production: 105t/d

 The new AAT emergency flare for the Sappi pulp mill at the Gratkorn plant in Austria has been in operation since September 2024. We are pleased about the many years of successful cooperation. Project data: - Flare for 600 m³/h gas flow - Thermal power 5,100 kW - LOGO control system - with pilot burner - Winter package with insulation and trace heating - gravel filter included in AAT scope of supply

Energy recovery from industrial wastewater AAT is taking part in the EU research project SYMSITES which is about circular economy and energetic utilisation of industrial wastewater. AAT built a hydraulic digester in pilot scale for the Austrian Ecosite. Project data: - Commissioning: 2023 - Substrates: flotation sludge, membrane retentate and slaughterhouse waste - Daily wastewater input: 4 m³ - Daily gas production: 6.6 m³ This pilot plant was specifically developed and built for an industrial company to take wastewater treatment to a new level. The pilot plant at a glance: - A 20-foot container houses the control system, the buffer tank, the pump technology, the gas technology and the centrepiece of the plant: a hydraulic digester with a capacity of 2.8 m³. - A 10-foot container serves as a gas storage. The energetic utilisation of industrial wastewater is not only an important step towards sustainability and environmental protection, but offers also valuable perception for the future of wastewater treatment. Related Links SYMSITES project website

The waste water treatment plant in Nemetin, Croatia has been expanded  AAT designed and delivered the gas line consisting of: gravel filter, gas cooling, gas warming, active carbon filter for the reduction of siloxanes and hydrogen sulphides as well as pressure boosters, a double-membrane-gas storage the emergency flare and agitators. This increases the service life of the CHP units for power generation and the operation reliability of the plant. Design data: - Gas cooling and warming Quantity: 200 Nm³/h - Active carbon filter: Quantity: 2x 200 Nm³/h Gas purification of the hydrogen sulphides to < 5 ppm H2S and siloxanes to < 2,0 mg/m³ - Double membrane gas storage: Nominal volume: 1.530 m³ - Gas emergency flare: Quantity: max. 250 m³/h

Electricity and heat from cattle manure In Japan, in the prefecture of Tochigi, a new AAT biogas plant was put into operation. The project was realised in cooperation with ENBC. The operator of the plant is Morinaga Milk Industry, which produces 616 Nm³ of biogas per day from cattle manure. When planning the plant, particular attention was paid to implementing a circular economy. The resulting digestate is dewatered and the solid fraction is used as bedding for the stables after drying. The separated liquid fraction passes through a downstream full treatment process to produce clear water. Technical data for the plant: - 1 digester with total volume of 1,100 m³ ( Ø 15m x 7.25 m) - Biogas production: 616 Nm³/d - Digestate for use as fertilizer: 29 to/d - Capacity generation electrical energy: 54 kW - Energy generated: 471 MWh/a - Capacity generation thermal energy: 71 kW - Thermal energy generated: 619 MWh/a

Pioneering project in Switzerland  With Recycling Energie AG we have already successfully implemented the largest biogas plant in Switzerland. Now a CO2 liquefaction plant was built as an expansion to the biogas plant, operated by CO2 Energie AG, which was founded specifically for this purpose. Biogas produced from organic waste is used for electricity and heat production by CHP units and is upgraded to biomethane. The biomethane is fed into the natural gas grid, the CO2 was previously released into the atmosphere. The new plant uses a cryogenic process to liquefy gaseous CO2, making it available in liquid form for storage and transportation. The food-grade liquid CO2 will be used in food production, the construction sector, greenhouses and silo fumigation in the animal feed sector and replaces the fossil-based CO2 currently used. The construction of the first plant of this kind in Europe is an important milestone on the way to decarbonizing the energy system. Marketing the liquid CO2 as a product from the biogas plant is an interesting aspect for plant operators in terms of economic efficiency and sustainability. Project data: - Capacity: 500 kg/h liquid CO2 - Production: roughly 4.000 t/a liquid CO2 - Pressure: 18 bar - Temperature: - 24°C - Modular container design - 2x 12m high storage tanks

Double membrane gas storage for extreme climate conditions!  Since the beginning of this year the AAT double membrane gas storage with 5.000 m³ is set up in Juuka, Finland. It was built for our customer Doranova Oy and is suitable for the extreme temperature conditions in Northern Europe. We are looking forward to implement further projects in Finland with 30 years of AAT expertise and specifically tailored solutions for our customers. Project data: - Volume 5.000 m³ - Operating pressure 10mbar - Diameter 22,45 m - Height 16,84 m - including snow clearance rope - ambient temperature min. -30°C, max. +70°C